Electric controller.



No. 344,379. r PATBNTBD PEB. 19, 19o-7.

\ LB. MARSHALL.

ELBGTRIU GUNTROLLBR.

APPLICATION FILED MAY 29. 1906.

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PATENT OFFICE.

Specification of Letters Patent.

Patented Feb. 19, 1907.

Application med my 29.1906. serai No. :nazca To all whom it may concern:

Be it known that I EDWIN MARsHALL, a citizen of the United tates of America, residing at Warrensburg, in the county of Johnston and State of Missouri, have invented certain new and useful Improvements in Electric Controllers, of which the following is a specification, reference being had therein to the accompanyin drawings.

This invention re ates to electric controllers, especially adapted for the use of dentists or physicians in the manipulation of various electrically-driven appliances or instruments required in their practice; and the prmiary oblect of the invention is to provide a simple, convenient, and com act controlling device adapted to be secure to a Wall or other suitable suppprt in position f or the attachment thereto of different a pliances.

A further object ofP the invention is to provide an electric controller of the character referred to with a combination binding-post andswitch-contact, whereby either one or two electric circuits may be closed accordingly as the switch-lever used with the combination binding-post and switch-block is turned, thus permitting two independent instruments or tools to be actuated at t e saine time or only one, as may be desired.

A further object of the invention is to provide an electric controller, comprisin a box or casin containing a resistance-coi with a plura ity of contact-buttons each having an inde endent connection with the coil and a sin lie contact-button connected in series wit a lamp-circuit, whereby through the manipulation of a switch-lever the strength of the current passing through the translating device or devices may be graduated' and permitting the full strength of the lamp-current to be used when required.

A further object of the invention is to utilize the heat of the coil Within the controllercasing to su ply heated compressed air directly from t e controller-casing.

A further object of the invention is to rovide a wall-casing with a forwardly-inclined lamp-socket support to reject an electric lamp away from lthe wa, to avoid heating the atter.

With these several objects in view the inpivoted to the front plate 2 upon a In the drawings, Figure 1 is a ront elevation of an electric controller embodyin the invention. Fig. '2 is a side elevation o the same. Fi .Bis a central vertical section of the device, an Fig. 4 is ay detail perspective view of the lower portion of the controller. y

The reference-numeral 1 designates a metallic casin closed at its top., bottom, sides, and back, a l of which parts are preferably an integral castin The front of the casin is closed b a ate 2, of insulating `material, preferahy ofp marble or like material, said plate having an air-tight connection with the casing by means of'a packing interposed between the front edges of the casing and the plate. From each of the four corners of the back of the casingdprojects a lug 3, having an integral perforate ear 4 to facilitate the attachment of the casing to a wall or like suport. From the to of the casing projects a orwardly-inclined oss 5, upon which is secured a lam -socket 6. This construction projects the amp-socket and the lamp to be applied thereto forward in an inclined osition away from the Wall to avoid undue eatin of the Wall.

ithin the casing 1 is supv orted a resistance-coil 7, Wound upon a ollow core 8, adapted to serve also as a conduit for compressed air. An inlet 9 admits the compressed air to the interior of the casing from any suitable source, and a discharge-nipple 10, located at the bottom of the casing below the core 8, serves as an outlet for the air. The nipple 10 is provided with a valve 1 l and is threaded at its lower end for the attachment thereto of a suitable hose. The compressed air introduced into the casing first circulates around the outside of the coil and is thus partially heated. It then passes into the perforated upper end of the core and down through thecore, a series of baillelates 12 arranged in staggered relation With- 1n the core preventing a too rapid circulation of the air, thus insuring its being heated sufficiently from the heat of the coil before its discharge through the outlet 101 Across the upper portion of the front plate 2 are located a series of contact-buttons 13 and 14,'said buttons being arranged, as shown, to describean arc corres onding to the path of movementof a switch-lever 15, V pivotl. ins 17, projecting from the plate 2 at opposite sides of the lever 15 serve as stops for said lever.

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that the strength of the current may be graduated as the switch-lever successively makes contact with said buttons. The wiring or electrical connections are not shown, as the windings for provid" shunt-circuits of raresistance willlnie readily understood by tose skilled in the art-to 'which the invention relates. The last contact-button 14 is in series with the circnitof the electric lamp to be used with the controller, so that when the switch-lever contacts with said button 14 the full strength of the lamp-current is supplied tothe translating device through the means which will now be described.

Adjacent to the lower end of the front plate 2 are provided two of bndingposts, each pair consisting of an outer post 18'and an inner post 19, the latter being preferably in the form of rectangular metallic blocks to adapt them to serve the double purpose of binding-posts for securing the conductor-wires of a translating device and of switch contact-blocks for a switch lever or plate 21, pivoted at its upper end upon the pivot 1610i the switch-lever 15. The lever 15 is provided with a knob 22 to facilitate its being turned upon its ivotal su port. The binding-screws 23 o the bloc s 19 serve as stops for the switch-plate 21.

The utility and operation of the device constructed as above described will be read- 4o ily understood. The pivot of the switch-lcL ver 15 is electrically connected to one terminal of an electric circuit, the other being represented by the contact-buttons 13 and 14.

It will be apparent that by placing the switch-lever 15 in' contact with the first in 13 a current `of the minimum strength willpbe directed through a circuit, including said button, the switch-lever 15., the switch-plate 21, and through yone pair or both pairs of the 5o bindingosts 18 19, according 'm the osition of t e switch-plate 21.

If said plate is g in contact with both `of the blocks 19, asi shown by the full lines in 1 and 4, the i current will pass through be pairs of binding-post conductors to actuate tryo independent translating devices;A but if the switch-plate is turned to by the dotted lines in Fig. 1 one. pair of conductors 20 is cut out. By moving the switch-lever to the next button 13 the cnrrent is increased, and :so on., a gradual increase of current followithe successive contacts of the switch Wi the buttons 13 the position yshown adapted to be connected to said coil indeuntil the last button 14 is reached, when the l' full lamp-current pass to the translating device or devices as said lastjmtton 14, as above explained, is connected in series with the lam uit. y

It be apparent that the improvement rovides a convenient and compact controldevice, req littleapace and few and simple parts, and t at it permits of the use of two int 'nn ements at the same time, thulnreatly feci listing dentalor like professio work. y i '75 The relative arragement of the two switch-levers 15 and 1 permits them` to be secured l) a pivotal connection, andthe doub e function of the blocks 19 (they serving as both binding-post and switch-contacts) materially simplifies the device and4 reduces the cost of manufacture. Again, the utilization of the heat of the resistance-coil to heat com ressed air is an important characteristic o the invention, as it ada ts the controller to serve this additional use 4purpose and obviates the necessity of employing a special and separate air-heating device in dentists oilices.

I would have it understood that the invention includes all such modiiications and var riations in the minor details of construction as may be resorted to without departing from the scope of the following claims.

What I claim, and desire to secure by Letters Patent, is

1. In an electric controller, the combination with a cas' and a resistance-coil suprted therein, o a series of contact-buttons pendently to provide electric circuits of varying conducting capacity, a switch-lever pivotally supported u on the casing and adapte ed to contact wit said buttons,v and two pairs of binding-posts, one of the posts of each pair serving as a switch cointact-block, and a switc -plate electrically connected to said lever, 4and adapted to contact with one or both of said contact-blocks.

2. In an electric controller, the combination with a casing, a resistancqcoil located therein and a series of contact-buttons adapted tolie electrically connected to said coil, of a switch-lever adapted to contact with said buttons, two pairs of binding-posts on said casing, one rol the posts of each pair serving as a switch contact-block, and a switch-plate secured upon the pivotal snp rt of said lever, and adapted to contact with one or both of said blocks. 12o

3. In an electric controller, two airs of binding-posts, one post of each pair ing a combination binding-post and switch-contact, in combination with atpivoted switchplate ada ted lo contact one yor both ci said com inalion binding-post and switchcontacts, and binding-screws on said switchcontacts for said switch late,

4. In an electric eontmller, the com 'nation with a metallic casing, a resistance-coil 13o therein, and a lamp-socket carried by the plate with which the latter is adapted to conxn efsying, of a series of contact-buttons adapted met. Y to be electrically connected to said coil, and In testimony whereof I affix my signature a, corllltet-bution fzr said lamp-soellet, l in the presence of tywo witnesses. switc -ever a a te to Contact Wit sai button, s tops for 1s)a.id swith projecting from EDWIN MARSHALL the front of the casing, and a, switehlate VVitnesseS:` pivotelly secured upon the pivot o the MAX H. SRoLovITz,

F. O. MCCLEARY.

switch-lever, and switch-contacts below said 

